CN116833514B - Welding method for improving all-position welding quality of marine riser 5G and product thereof - Google Patents
Welding method for improving all-position welding quality of marine riser 5G and product thereof Download PDFInfo
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- CN116833514B CN116833514B CN202310603625.6A CN202310603625A CN116833514B CN 116833514 B CN116833514 B CN 116833514B CN 202310603625 A CN202310603625 A CN 202310603625A CN 116833514 B CN116833514 B CN 116833514B
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- 238000003466 welding Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000007547 defect Effects 0.000 claims abstract description 20
- 238000010891 electric arc Methods 0.000 claims abstract description 12
- 230000001965 increasing effect Effects 0.000 claims abstract description 8
- 230000005484 gravity Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention provides a welding method for improving the welding quality of a marine riser 5G all-position and a product thereof, belonging to the technical field of welding, wherein the welding method specifically comprises the following steps: the marine riser 5G is welded at all positions in a unified welding mode, the directivity and stability of an electric arc are improved at the overhead welding position by reducing preset voltage or preset inductance, and meanwhile, the arc swing width is increased at the overhead welding position to eliminate unfused defects. The invention applies the unified welding mode suitable for flat welding to the marine riser welding, effectively simplifies the process of the marine riser 5G all-position welding, and simultaneously considers the problem of poor stability when the marine riser is welded by utilizing the unified welding mode.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a welding method for improving the all-position welding quality of a marine riser 5G and a product thereof.
Background
Steel catenary risers have gained favor in deep water development because of their strong high temperature and high pressure resistance, relatively simple manufacturing process, and lower cost since they were first applied to tension leg platforms in the gulf of mexico in 1994. With the increase of the water depth and the increase of the length of the vertical pipe, the marine environment is more severe, and vortex-induced vibration generated under water can cause severe vibration at the position mutually perpendicular to the axis direction of the water flow and the cylinder. Meanwhile, when the steel catenary riser is connected with the platform through the joint, the alternating load effect can be multiplied, and the riser in the state for a long time can be shortened in service life due to frequent operation time, so that fatigue damage is caused at the welded joint. Therefore, higher weld joint quality is a prerequisite for marine riser safety service.
At present, the main domestic pipelaying vessels HYSY and HYSY and the working lines on Lanjiang No. are equipped with a full-automatic welding system which is Sturnax system produced by SERIMAX, and the welding core technology is kept secret all the time and depends on the welding technical support of manufacturers. In the prior art, under the condition of 5G all-position welding of the marine riser, the arc is unstable in the overhead welding state, so that the defect of unfused is easily caused, and the improvement of the quality of the marine riser joint is greatly limited.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a welding method for improving the all-position welding quality of a marine riser 5G and a product thereof, and aims to solve the problem that the arc is unstable and is easy to cause unfused defects in the overhead welding state in the existing welding technology.
In order to achieve the above purpose, the invention provides a welding method for improving the welding quality of the marine riser 5G all-position, which specifically comprises the following steps: the marine riser 5G is welded at all positions in a unified welding mode, the directivity and stability of an electric arc are improved at the overhead welding position by reducing preset voltage or preset inductance, and meanwhile, the arc swing width is increased at the overhead welding position to eliminate unfused defects.
Further preferably, the overhead welding position is at an overhead welding angle of 120-180 degrees.
As a further preference, the voltage is reduced by 0.5V to 2V to reduce the arc length.
Further preferably, the inductance is reduced by 0.5H to 1H to increase the arc stiffness.
As a further preferable aspect, the arc swing width is increased by 0.2mm to 0.6mm to eliminate the unfused defect.
As a further preferred option, full automatic welding is achieved using robots or rail dollies.
Further preferably, the marine riser is 6-18 inches in size.
Further preferably, the wall thickness of the marine riser is 19mm to 32mm.
Further preferably, the marine riser groove is in the form of a U.
According to another aspect of the present invention there is provided a marine riser manufactured by the above method.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
1. The invention creatively applies the unified welding mode suitable for flat welding to the marine riser welding, does not need to carry out complex matching of current, voltage and wire feeding speed, effectively simplifies the process of the marine riser 5G all-position welding, and simultaneously considers the problem of poor stability when the marine riser is welded by utilizing the unified welding mode;
2. Particularly, considering that the shape of a molten pool is uncontrollable due to the gravity of the liquid molten pool, arc instability and unfused defects easily occur at the position of a bottom welding corner of 120-180 degrees, the invention optimizes the specific angle of the bottom welding position and can further improve the welding quality and the welding efficiency of the all-position welding of the marine riser 5G;
3. meanwhile, the invention optimizes the reduced voltage, inductance and increased arc swing width, can avoid unfused defects and ensures welding safety.
Drawings
FIG. 1 is a marine riser welding RT chart provided in example 1 of the present invention;
FIG. 2 is a marine riser welding RT graph provided in example 2 of the present invention;
FIG. 3 is a welded object diagram of marine riser provided in comparative example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
According to one aspect of the invention, a welding method for improving the welding quality of the 5G all-position marine riser is provided, and the welding method specifically comprises the following steps: adopt the unified welding mode to weld marine riser 5G all position, consider under the unified welding mode, to marine riser U-shaped groove multilayer single pass welding, the overhead welding position leads to the molten pool shape uncontrollable because of liquid molten pool gravity cause, the unfused defect appears easily, so on the one hand can improve the directionality and the stability of electric arc through the mode that reduces preset voltage or reduce preset inductance in the overhead welding position, on the other hand can promote liquid metal lateral diffusion through increasing electric arc swing width in the overhead welding position to eliminate unfused defect.
Further, the position where arc instability and unfused defects are easy to occur is the position where the overhead welding angle is 120-180 degrees, namely the position from 4 o 'clock to 6 o' clock, and the unfused defects are easy to occur because the shape of a molten pool is uncontrollable due to the gravity of a liquid molten pool in the overhead welding position, so that voltage correction or inductance correction is carried out on the position, and meanwhile, the arc swing width is enlarged, so that the high-quality marine riser joint with stable welding process and no unfused defects can be obtained.
Further, the arc exhibits different weldability at different welding locations due to the fact that the melt pool is subjected to a number of complex forces such as gravity, surface tension, arc blowing, etc. The surface tension and the arc blowing force are forces for preventing the molten pool from flowing downwards, so that the supporting effect on the molten pool can be achieved, and particularly, the arc blowing force can enable molten pool metal to flow transversely from the middle to the two sides. However, gravity affects the weld formation to a maximum extent when the arc is in the overhead position, where the molten pool metal flows downward faster, particularly when the molten pool metal flows forward of the arc, and the arc is disturbed resulting in reduced stability.
Arc voltage is an important parameter affecting the stability of the welding process. The arc voltage is reduced at the overhead welding position, so that the arc length is shortened, short-circuit transition can be generated between the molten pool and the molten drop when the molten drop forms a smaller size, and therefore, the electric arc can be prevented from drifting, and the stability of the electric arc is ensured. On the other hand, inductance is also one of the important factors affecting arc stability. Reducing the inductance at the overhead position can increase the frequency of droplet short-circuit transition, thereby improving the stiffness of the electric arc and inhibiting the generation of large particle splashing when the electric arc drifts. The arc thrust can be enhanced no matter the arc voltage is reduced or the inductance is reduced, so that the transverse flow speed of molten pool metal is increased, and the unfused defect can be effectively eliminated by matching with the large arc swing speed.
But too low an arc voltage can cause the weld to assume a narrow dome shape, inducing unfused; an excessively low inductance can cause the short-circuit current to increase excessively fast, and explosion is easy to occur during the transition of molten drops; excessive arc swing width easily causes side wall arcing phenomenon caused by contact of the contact tip and the side wall, and undercut of the upper wall is caused. Therefore, the invention aims at the optimized voltage correction at the overhead welding position to reduce 0.5-2V, the optimized inductance correction to reduce 0.5-1H, and the optimized swing width to increase 0.2-0.6 mm compared with other positions, thereby effectively improving the arc stability and eliminating the unfused defect.
Further, a robot or a rail car is adopted to realize full-automatic welding.
Further, the dimension of the marine riser is 6-18 inches, the wall thickness of the marine riser is 19-32 mm, and the groove form of the marine riser is U-shaped.
According to another aspect of the present invention there is provided a marine riser manufactured by the above method, which is free of unfused defects and of high quality.
The technical scheme provided by the invention is further described below according to a specific embodiment.
Example 1
In the embodiment, the material to be welded is a marine riser with the size of 12 inches and the material X65, and the welding process adopted is CMT priming welding and GMAW filling welding. In the filling welding, the wire feeding speed is 9.5m/min at 0-120 DEG, and the welding speed is 470mm/min; the wire feeding speed is 8.5m/min at 120-180 degrees, the welding speed is 430mm/min, the arc voltage of the filling layer is reduced by 1.5V through voltage correction at 120-180 degrees, or the inductance is reduced by 0.8H through inductance correction. The arc stability is enhanced in the welding process, the phenomenon that the arc is attracted by the side wall disappears, the welding bead forming is normal, but RT results show that intermittent unfused defects exist at 120-180 degrees, as shown in figure 1.
Example 2
The material to be welded in this embodiment is identical to embodiment 1, and welding parameters such as wire feed speed, welding speed, voltage correction, or inductance correction at different positions are also identical to embodiment 1. The difference is that the arc swing width of the filling layer is increased by 0.4mm from 0 to 120 degrees at 120 to 180 degrees. The arc was stable during welding, the bead was formed aesthetically pleasing, and no unfused defects were found by RT detection, as shown in fig. 2.
Comparative example 1
In the embodiment, the material to be welded is a marine riser with the size of 12 inches and the material X65, and the welding process adopted is CMT priming welding and GMAW filling welding. In the filling welding, the wire feeding speed is 9.5m/min at 0-120 DEG, and the welding speed is 470mm/min; the wire feeding speed is 8.5m/min at 120-180 degrees, the welding speed is 430mm/min, the voltage and the inductance are not corrected by adopting the setting in a unified mode, and the arc swinging width in each filling layer is kept consistent at 0-120 degrees and 120-180 degrees.
When welded to 120 deg., the welding arc begins to diverge and drift, and the arc directivity is poor, and particularly when welded to 165 deg. to 180 deg., the arc is easily attracted by the side wall, and the weld bead is also biased to one side, as shown in fig. 3.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The welding method for improving the welding quality of the marine riser 5G at all positions is characterized by comprising the following steps of: the marine riser 5G is welded at all positions by adopting a unified welding mode, and the problem that the shape of a molten pool is uncontrollable and the unfused defect is easy to occur due to the gravity of a liquid molten pool at the overhead welding position is solved, on one hand, the electric arc length is reduced by reducing the voltage of 0.5-2V at the overhead welding position, or the electric arc stiffness is improved by reducing the inductance of 0.5-1H, so that the directivity and the stability of the electric arc are improved, and on the other hand, the unfused defect is eliminated by increasing the electric arc swinging width of 0.2-0.6 mm at the overhead welding position.
2. The welding method for improving the welding quality of the marine riser 5G at all positions of claim 1, wherein the overhead welding position is at an overhead welding angle of 120 ° to 180 °.
3. The welding method for improving the quality of the all-position welding of the marine riser 5G according to claim 1, wherein the full-automatic welding is realized by a robot or a rail car.
4. The welding method for improving the quality of 5G all-position welding of marine risers of claim 1, wherein the marine riser is 6 inches to 18 inches in size.
5. The welding method for improving the quality of the 5G all-position welding of a marine riser of claim 1, wherein the wall thickness of the marine riser is 19mm to 32mm.
6. The welding method for improving the quality of the 5G all-position welding of a marine riser of claim 1, wherein the marine riser has a U-shaped bevel.
7. A marine riser manufactured by the method of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310603625.6A CN116833514B (en) | 2023-05-25 | 2023-05-25 | Welding method for improving all-position welding quality of marine riser 5G and product thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310603625.6A CN116833514B (en) | 2023-05-25 | 2023-05-25 | Welding method for improving all-position welding quality of marine riser 5G and product thereof |
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| Publication Number | Publication Date |
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| CN116833514A CN116833514A (en) | 2023-10-03 |
| CN116833514B true CN116833514B (en) | 2024-05-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005246469A (en) * | 2004-03-08 | 2005-09-15 | Sumitomo Metal Plantec Co Ltd | Consumable electrode type arc welding process |
| WO2011013321A1 (en) * | 2009-07-29 | 2011-02-03 | パナソニック株式会社 | Arc welding method and arc welding device |
| CN103962685A (en) * | 2014-04-28 | 2014-08-06 | 天津大学 | Underwater welding rod semi-dry-type overhead welding method |
| CN112719515A (en) * | 2021-01-25 | 2021-04-30 | 武汉锅炉股份有限公司 | Rail TIG welding method for black and white pipe |
| CN113894392A (en) * | 2021-09-30 | 2022-01-07 | 北京博清科技有限公司 | Welding process method for overhead welding and bottoming |
| CN115673476A (en) * | 2022-11-21 | 2023-02-03 | 上海外高桥造船有限公司 | Overhead welding process |
-
2023
- 2023-05-25 CN CN202310603625.6A patent/CN116833514B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005246469A (en) * | 2004-03-08 | 2005-09-15 | Sumitomo Metal Plantec Co Ltd | Consumable electrode type arc welding process |
| WO2011013321A1 (en) * | 2009-07-29 | 2011-02-03 | パナソニック株式会社 | Arc welding method and arc welding device |
| CN103962685A (en) * | 2014-04-28 | 2014-08-06 | 天津大学 | Underwater welding rod semi-dry-type overhead welding method |
| CN112719515A (en) * | 2021-01-25 | 2021-04-30 | 武汉锅炉股份有限公司 | Rail TIG welding method for black and white pipe |
| CN113894392A (en) * | 2021-09-30 | 2022-01-07 | 北京博清科技有限公司 | Welding process method for overhead welding and bottoming |
| CN115673476A (en) * | 2022-11-21 | 2023-02-03 | 上海外高桥造船有限公司 | Overhead welding process |
Non-Patent Citations (3)
| Title |
|---|
| 管子对接全位置TIG氦弧内焊工艺研究;费大奎;张焱;于丹;杜兵;;焊接(第07期);第66-68页 * |
| 陈志刚等.《压力容器焊接工艺和焊接缺陷处理案例》.冶金工业出版社,2018,第111页. * |
| 雷玉成等.《焊接成形技术》.化学工业出版社,2004,第37页. * |
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